170 is the smallest number that can be written as the sum of the squares of 2 distinct primes, where each of these primes is the square of a prime added to another prime (170 = (22 + 3)2 + (32 + 2)2). [Thoms]

The start of a record-breaking run of consecutive integers (170-176) with an odd number of prime factors. [Honaker]

(There is one curio for this number that has not yet been approved by an editor.)